47-55.1 dump body manufacturers in 1948?

[1948ChevyDumpFixer]

where do I start trying to identify the manufacturer of the dump body for my 1948 ton and a half? I'm assuming this is a relatively local truck to NC, but I haven't got my title search results back yet to know for sure.

I will post some detailed pics tomorrow, but would love any links.

The PTO and dump bed operate from two unmarked straight levers in the middle of the cab next to the seat. They look almost home made, which is entirely possible, lol, but the dump bed is very well done.

Thanks for any input!